"My first time was... supposed to be with him...!" Miu and Takeru have been dating for a month. Trying to make progress in their platonic relationship, Takeru invites Miu to his house. On the way, he hands the spare key to Miu and tells her to go ahead while he shops for something. With her heart pounding, Miu opens the door... and runs into Takeru's brother in the house that was supposed to be deserted! "You were gonna do it with Takeru anyway. I'll be your practice partner." She can't hold back from getting wet as her pink nipples are thoroughly played with, even though her heart denies it... The older brother's skilled fingers shifts her underwear aside and squelches inside her...!

(Source: Eromangajima, translated)

Note: Released as 18 episodes and sold as 6 chapters.