SONE-011 I lost my mind to her little sister's unintentional summer outfit peekaboo... Riri from Nanatsumori

A younger sister named Riri-chan who is cuter and more innocent than my girlfriend. But since I met her, there's something that bothers me... it's the revealing summer fashion of modern girls. Plus, when she relaxes at home, her panty line is clearly visible through her skirt. And to make matters worse, she doesn't wear a bra, so when she bends over, you can see her nipples—a lucky peep show that I can't help but stare at. Even though I know it's wrong, my reason flies out the window with her unguarded temptation, and before I know it, I'm groping her breasts and going wild with thrusts. Even with my girlfriend nearby... I get swallowed up in the taboo pleasure, overheating until I have heatstroke from the intense pounding, cumming all over the place. Our lust doesn't stop, and we ravage each other through one hot summer of memories...