Ahem, more rinbachisagi smut ideas for you...I'm too tired to write anything else
Rin fucks you in doggy while you suck off Bachira, who's getting pegged by isagi: he starts crying from overstimulation after he cums quickly, and you pull away from him. Isagi comforts Bachira, still inside of him. Rin continues to bully your insides from behind until you bury your face into the bed and cum, legs shaking.
You lay on Bachira, cuddling him, before asking to ride him. Rin holds you from behind, and Isagi kisses Bachira, swallowing his moans. Rin presses his fingers against your clit to make you cum, and you drag Bachira over the edge.
Rin and Isagi are still pent up, so while you and Bachira recover, cuddling together, they frot, seething and staring at each other with frustration until they start making out and cum on each other.