IPX-858 "She's right nearby..." Defeated by her little devil sister's sweet dirty talk and nipple torture, I came while cheating. Aimiru Saitou

Since my family isn't coming back, I'm staying over at her place today. I was all geared up to indulge in H until she gets back, but then her sister appeared in front of me!? It seems her travel plans got canceled… Then her sister says to me in a cute voice, 'I'm better at H, you know?' Unexpected seduction! She even starts playing with my erogenous zone, my nipples… If her sister, who is more attractive, has a better figure, and better technique than she does, invites me, will I do it? Or won't I?