妹のアナル調教シミュレーター

"Oniichan. You can do it in my butt. Just don't put anything weird inside, ne?"
Spread the rusty brown ring of a virginal imouto, experiment with what feels good.
"Oniichan... that's too big to fit..."

Choose your toy.
Cram it up her anus.
Split that hole.
Train her to obey.
???
Profit!