PPPD-451 [vietsub] The older sister helps the younger brother study

When I went to my girlfriend's house to visit, I met my girlfriend's foreign sister at home. She lives in a Western style so she's very liberal and sexually similar. I didn't expect her ability to provoke people and her charm. She made me fall in love and went to bed with her even though my girlfriend was there but she still didn't let me go.

PPPD-451 [vietsub] The older sister helps the younger brother study