In standard Forest Fashion, I forgot my plan for this book due to college so I will be rewriting this. 

Rewrite has: 

Rein x Elysia

Rein is a soldier under House Crozzo, and Elysia is a part-time idol. 

The two will have an extremely wholesome ship because why not? 

Elysia is also the mother figure of Reve, Rin, and Rex

Rita x Reve 

Rita is hired to be House Crozzo's maid by Otto and Reve accidentally rizzes Rita up.

Rita is a bit of a perv for Reve. She is a yandere but she can control her instincts

Rex is a sigma here, he is busy all the time.