"Even Though I Shouldn't Cum..." Lewd Fingerings of My Boyfriend's Big Brother

"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...