You and Sirius were putting your son, Sevi to bed. You guys noticed that Sevi was lonely and needed someone to play with or atleast talk to

"Darling, don't you think.. Sevi needs a little sibling?"

Sirius smirked as he then hugged you from behind while you were looking at Sevi who was asleep

"We could start trying.. right now. Plus, Sevi is already 3 years old. And he's asleep.."

Sirius whispered to you seductively. He was hoping for you to agree to his request