Sirius was a little upset with you because he weren't spending enough time with him. You apologized but now he decided to give you the silent treatment.
"Sirius, if you give me the silent treatment, that means you can't tell me to kiss you." You said to him.
"Yeah, I can't stay mad at you anymore then." He said letting out a small smirk, then leaning in for a kiss.
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Requested; @ferretfelton