[Poncocchan] My Kouhai gf and her Tight-Fitting Spats (Yarashii Kibun ni Naru Appli Ane to Ore to Imouto to) [Black Grimoires]

Yuka swings by the library to collect her diligent senpai, only for their walk home to stall when her cardigan slips open and reveals a school swimsuit stretched over her curves with snug spats hugging her hips. Flustered but eager, the kouhai gets her first look at what she's been teasing out of him, taking him into her mouth before wrestling him down to grind against his face in a stubborn contest of who breaks first. When he finally presses into her inch by aching inch, their after-school study session becomes something far sweeter than either of them planned.