The idea: "Heroines in Training; Ochako is slapping her hairy pussy against Tsuyu's messy bush in missionary, Tsuyu and Ochako are kissing heatedly in the first panel as the bed shakes underneath them.
Second panel: Izuku arrives and he gets a face full shot of their pussies pushed together and Ochako says 'Deku join us'!
Third Panel: Izuku is thrusting into Ochako and Tsuyu simultaneously while using One For All Full Cowl 20%, both pressed together.
Final Panel: Izuku cums into Ochako and Tsuyu simultaneously as they slap their pussies together.
(You already know how I prefer the tribbing position :P)"