Sirius hardly needs to be asked twice, his mouth splitting into a wide, delighted grin before he leans in to press a kiss to Kieren's lips, wet and messy and hungry right from the start. As much as he'd loved having his mouth on Kieren's cock, this act is more responsive and he groans into the wet of Kieren's mouth as he carefully tucks Kieren's cock into his pants with the one hand.