The animation was relatively smooth for a VN and played out very thoughtfully.
Not once did I ever feel like I was watching a .GIF (i.e. just a random animation thrown in, move on, etc)
I like how you had things going on during the sex animation itself. Peter says some drunken thing, Lois is surprised while in the pose, she opens her eyes to view you, Quagmire, etc. Played out like an event, that's what matters. Even if you don't do animations often, when you do an approach like this would be the way to go.
Thank you for considering my plat heels suggestion by the way. Can't tell you how happy I'd be if one update I suddenly see Lois rocking some kinky footwear like that.