There is the latest kid Loki who definitely seems to have a crush on Sif (eg, in these comics part 1 and 2) and the past Loki who seems to covert Sif too, especially in the Loki comics (source).
Did Sif and Loki date? There is no evidence in the Poetic or Prose Eddas that the two were ever a couple. However, in the Lokasenna we see this exchange in which Loki tells the gods that he had carnal relations with Sif, and Sif does not refute the point.
After he's captured by the TVA, Loki's tasked with helping it track down a variant of himself — Sylvie, a female Loki hellbent on revenge against the Authority. After facing down an apocalypse together, the two fall in love, which has reality-shattering implications.
He delicately plays with the hair of a handmade Brunhilde-shaped doll, a peculiar manifestation of his unspoken feelings. In this private moment, Loki confesses his love for Brunhilde, showcasing the complex and conflicting emotions of Loki.
In the comics, Loki admits to being pansexual during his time as a Young Avenger and expresses attraction to both genders in Loki: Agents of Asgard. In the TV series Loki, he tells Sylvie that he has been with men — chiefly a prince — and women.
He also had numerous affairs with men, women, and even a horse. That doesn't fit our modern idea of a faithful and loving marriage. But there's also no mention anywhere of Loki being forced to marry Sigyn.
But despite all the chaos Loki might have created, all the things he has ever done, one thing is certain. Loki absolutely, without out a shred of doubt loves his mother. Many things can be said about him, but his heart do not lie. He loves Lady Freya.
Loki is married to Sigyn and they have two sons, Narfi or Nari and Váli. By the jötunn Angrboða, Loki is the father of Hel, the wolf Fenrir, and the world serpent Jörmungandr. In the form of a mare, Loki was impregnated by the stallion Svaðilfari and gave birth to the eight-legged horse Sleipnir.
Even though Loki frequently tells lies as part of his schemes, he is also known to speak the truth, so it is possible he and Sif did have an affair. This would not be unusual since fertility goddesses are often depicted as having sexual relations with men other than their chosen mate.
At some point in her life, Sif met Thor, falling in love with him and later getting married. Sometime during their marriage, Thor in an act of infidelity, cheated on his wife Sif with the Jötunn, Járnsaxa. Through Járnsaxa, Sif became the stepmother to Thor's eldest son, Magni.
In an act of jealousy, Thor's adoptive brother Loki cut Sif's golden hair while she slept, but replaced it fearing retribution with new locks made by dwarves Eitri and Brokk. But Loki reneged on their payment so the dwarves caused the hair to turn black when placed on her head.
Sif the warrior even tried to compromise and live a mortal life, for a time. She quickly got bored, though, and grew frustrated that Thor had only affections for Jane Foster. Sif does love Thor, but their attempts at relationship are always frustrated by the interruptions of another woman, be it Jane or Amora.
Loki's most important past canon romantic/sexual relationships have been with Amora, Loreli, Sigyn, and Angerboda. Amora and Lorelei are sisters and sorceresses who are generally up to no good, and Loki has teamed up with them as antagonists against Thor and Asgard on a number of occasions.
Angrboða (Old Norse: [ˈɑŋɡz̠ˌboðɑ]; also Angrboda) is a jötunn in Norse mythology. She is the mate of Loki and the mother of monsters. She is only mentioned once in the Poetic Edda (Völuspá hin skamma) as the mother of Fenrir by Loki.
He found her dozing with her gorgeous hair flowing all around her, and his evil mouth smiled at this chance to make trouble in the Thunder-God's household. He knew that Sif's hair of gold was Thor's greatest treasure - and he was determined to take it away from him.
Loki birthed Sleipnir after he transformed into a mare and mated with the master builder's stallion, Svaðilfari, to prevent the master builder from completing his fortifications around Asgard, the realm of the Æsir gods.
Here, holding on to all of the timelines, he became a kind of tree god, physically representing the Norse tree of life, Yggdrasil. It was a poignant and painful ending for Loki, who now seems to be sentenced to being alone for eternity as he watches over the timelines.
Why did Loki turn into a woman? In the comics, Loki is reborn as a woman, known simply as Lady Loki, after the events of Ragnarok in Asgard, but even that wasn't too innocent: When Thor and his fellow Asgardians are to be reborn in new bodies on Earth, Loki actually stole the body intended to be for Sif.
In his exile, Odin apparently thought over all the acts he had done and likely felt remorse over them, as he showed no hostility towards Loki and even noted Frigga would be proud of him. He also admitted that he truly loved both of his sons and expressed remorse for failing to stop Ragnarök.
Loki , the God of Mischief , has captured the hearts of many with his charming personality and complex character development . Unlike his brother Thor , who is often portrayed as a traditional hero with brute strength , Loki 's cunning and unpredictable nature make him a more intriguing and dynamic character .
Regarding the accusations that Loki makes to Sif in Lokasenna, Carolyne Larrington says that Sif is not elsewhere attested as unfaithful, though notes that Odin makes a similar accusation in Hárbarðsljóð, and theorizes a potential connection between the story of Loki cutting off Sif's hair with these references.
As Odin's wife she was the highest of the Asynjur, the female deities in the Norse pantheon. Although Frigg loved Odin, she was known to have had an occasional affair. Odin was not a faithful husband, either; Frigg's rivals included Rind, Gunnlod, and Grid.
