HUNTB-078 My usually non-sexual little sister's first time showing off her club uniform with her ass sticking out is way too erotic! 2 I couldn't hold back and forcefully did it raw & came inside multiple times...!?

When I say that I have a younger sister who is a female student, people around me envy me, but in reality, I'm so used to seeing her in her school uniform that I feel no eroticism at all. Such a sister was selected as a regular member of the club activities and came to show off her uniform to me in high spirits… Her tight-fitting uniform and protruding butt were too erotic, and unexpectedly, I got a full erection! I lost control and inserted myself into my sister & ejaculated inside her! Instead of protesting, she exploded with pent-up desire from being so focused on club activities!? My sister herself sought out my penis!