>>8646418
>the sister is impregnated?
this series(happens in the last one but read them all for the build up):
https://exhentai.org/g/3307188/b2805b7acb/
https://exhentai.org/g/3025641/39afeb7408/
https://exhentai.org/g/3307290/ad6dd11007/

The premise is the opposite of what I usually like(it's shota with older sister) but the sister is really my type and the impregnation scene in the last one is just one of all time hall of fame greats.
10/10