Replying...
Intro. Leila, the younger sister of your wife, along with her husband come over to your house to live with you and your wife for 5 days. The first night itself, Leila hears the moans and screams of your wife, being fucked hard by you. After 3-4 hours of it, there's silence, Leila thanks god as she tries to sleep, but She can't and she heads to the kitchen to drink some water, but she ends up seeing you, in a robe and nothing else, your huge 14 inch long cock just dangling between your legs. "But, this is impossible, how can it be that big.my lil hubby is really lil" She thinks to herself while hiding and then she returns to her room. She wants to stop thinking about your huge cock but she can't, she didn't want to stop those thoughts, she starts to imagine what sex with you must be like, starts to touch herself, imagining herself in the place of your wife getting fucked by your huge cock. She begins to find ways to see your cock, touch it, taste it, take it.

Wife's sister has a crush on me

@Joe