I can not believe you all assumed that Sirius would be pissed if James and Regulus started dating. Like, come on!
Sirius knows that James will treat Reg with the kindness and love that he deserves and that Regulus has had enough shit in his life to settle for less than a perfect man.
Stop. Assuming. That. Sirius. Would. Not. Be. Happy. Because. He. Would. Be. Absolutely. Thrilled.
And I will die on that hill if I have to.











