[Sanukiyan] Kyou, Sensei to Hajimete o. - Kizutsuku Made Tsuyoku Daite - chapters 1--3 [Kanzenban]

A runaway schoolgirl with a beauty mark and a soft, full figure turns up alone on a night street, fleeing a home where her mother's lover sees her as prey — and the teacher who finds her can't bring himself to walk away. When she straddles him bare and asks him to show her what sex is really like, offering her first time, their bond deepens through stolen days together: horror attractions where she clings trembling to his arm and lazy afternoons sprawled on his sofa wishing they could last forever. But as she reaches out her hand and asks what he truly thinks of her, the fragile question hangs in the air between a student seeking shelter and a man falling for the girl he took in.