My stepsister relaxes my vagina to prevent premature ejaculation

I've been struggling with premature ejaculation for a while now, and my girlfriends have been growing increasingly frustrated. But thankfully, my stepsister has come up with a solution. She's got this tight little pussy that needs to be stretched out regularly to keep it from being too tight. So, she's agreed to let me use her as a training partner. Every time I get close to climaxing, I slip inside her and it helps me last longer. It's a win-win situation for both of us. For me, it's a way to improve my stamina, and for her, it's a way to keep her pussy from getting too tight. Plus, she's got this amazing body and an ass that won't quit. So, even though we're not really sisters, we've found a unique way to bond. And let's not forget about the fact that she's got a monster cock that she loves showing off. It's a sight to behold.