while i dont have an idea for the actual scene, id imagine it would start out very soft and loving and stay loving through it. but getting rougher as it goes on as mac gives the okay. i think consent would be a big thing for mac! he may be very nervous as it may even be his first time but his love and trust for killigan would help ease him of those worries and just enjoy himself. maybe let him explore killigan, as the other sex scenes we dont see much of their interactions with killigans body. only him with theirs. idk these are just my thoughts