[Airandou] Manatsu no Triangle (COMIC LO 2021-12) [MrBubbles]

Two twelve-year-old girls, Nanami and Sana, show up to drag their sleepy classmate Takuya out of bed for school, but curiosity about his body quickly derails the morning into hands-on lessons neither girl is willing to cut short. What begins as nervous first-time oral exploration escalates into full penetration and then into a sweaty competition where both girls race to see who can wring the most cumshots out of him across a long summer afternoon. By the time all three collapse drenched and breathless on the floor, they are already plotting tomorrow's rendezvous because their summer break is far from over.