HUNTB-434 - My sis-con sister got jealous when I got a girlfriend, so she crossed the line and seduced me with her tongue

My sister has always been obsessed with me, and I thought she’d back off once I got a girlfriend, but I was dead wrong. Consumed by jealousy, she crossed a line she shouldn't have. She’s using all her adult techniques to dominate me, completely putting my inexperienced girlfriend to shame. I tried to resist, but after some intense nipple play, I completely gave in. I've lost count of how many times she's made me finish since then. I don't think I can ever go back to normal sex with my girlfriend again.