[Miyazen] Sis for Sis (COMIC LO 2023-07)

When her big sister's tutor shows up for a study session, little Otoka pounces on him instead—teasing that he's already hard and making him promise their lessons stay secret from Wakaba. Taking full control, she milks him with teasing handjobs and sloppy blowjobs before riding him in commanding cowgirl, cooing about how she's been coming on to him all this time and begging him to use her however he likes. The real twist comes afterward, when Otoka strolls home and sweetly invites Wakaba to join their next study session, promising her sister that Sensei has plenty more he can teach.