SPOILER
Reading Jin's day 10 and something he said to Leia gave me a theory, Leia was talking about Leo and saying "he only cares about 1 thing and she doesn't have it" which prompted Jin to ask if she was still upset because "dad had to force them two" and then Leia cut him off, and on Leos day 9 when he and MC kissed he said it was his first kiss even though he's slept with somebody, which leads me to think that Leia is the one Leo slept with and it wasn't either of their choice and not romantic at all, which leads me to wonder why Gerald forced them to sleep together and why he felt he had to, no matter the answer it seems like a real fucked up situation.