Unlisted due to Yuki's body type. Only make an offer if you're willing to draw her as is without altering her figure.
Yuki and Rena
Keep their body types as they are in the references.
Rena kisses Yuki while fingering her with her right hand. Her thumb rubs Yuki's clit. Yuki hugs Rena.
Both are blushing. Just cheek blushes are fine. Yuki's juices are on the fingers inside her. Background is Yuki's heartscape. Draw the background in the same style you draw the characters.