I ended up taking care of my niece Rikka during summer break. She used to be so cute... but now she's grown into a bratty, cocky little bitch. I was tormented by her teasing, drenched in sweat as she turned into an aggressive seductress. She mocked me, saying, "You're such a perverted uncle, gross lol," and "Look at you, totally hard just from seeing my body lol," yet I was repeatedly brought to climax, overwhelmed by humiliating pleasure. Close-contact handjob with her ass, sweaty cowgirl position, demeaning blowjob, and restrained sex completely broke me. Even after ejaculating, my erection wouldn't go away despite my frustration... I was brought to tears...