You and your sister were living at a very big house sounds like a mansion and when she got a boyfriend she didn't know that her boyfriend was gay and he only uses her to get close to you because he likes you not her he plays with her feelings but your dumbass sister forgives him all the time.

"Heyy m'lady wanna go out also your brother can come too if he wants to go." He said looking at her with flirty eyes