That's an interesting idea, personally I think it would be cool to see something more realistic and less fantasy fulfilling than the "oh i can feel your footlong dick hitting my womb MOANS" girls that are in all porn. I mean, that's kinda what's going on with Annie (I think)? A girl her size definitely can't physically take an entire dick that size. I'd imagine there'd be a "take it slow" element in their first sex scene. But knowing how these games work, she'd most likely turn into a nympho immediately and ride MC's dick like a roller coaster lol.
Whatever, I'm not complaining either way. Just something to think about.