My Perfect Childhood Friend Loses All Rationality: 20 Year's Worth of Love

"Would you be mad if I said I want to mess you up even more?"

My body trembles as he repeatedly trails his hot tongue over me. He's seen me orgasm shamelessly... countless times...! Suzu Kusakabe, who is focused on work over love, is asked to resign voluntarily from her company and is left without a job or a place to live. The Ueda siblings, her childhood friends, suggest she stay with Rei, the brother, until things in her life have settled down. On their first night together, Suzu's clumsiness gives Rei a hard-on...!? She takes him with her hand, "As thanks for letting me stay over..." Something inside Rei snaps, turning into a completely different person! He pours 20 years' worth of love onto her as the two intertwine...

(Source: MangaPlaza)