I have stopped masturbating while trying to conceive with my wife. Her adult sister Azu knows it and deliberately gets me hard. I try to resist for fear of being caught, but she toys with me through air blowjobs, exposes only the head through my underwear, and flicks the tip with her tongue without ever taking me fully into her mouth. After being denied again and again, ejaculation overwhelms reason and I beg her to suck me. She taunts me about abandoning the baby-making plan, then uses tiny touches to trigger repeated ruined orgasms from my oversensitive cock. By the end, both my fertility plans and my judgment are wrecked in this NTR tease.