A master's new pet

Smut.. It is mature.. Very mature.. Very lose plot mostly smut. OOC. The order of the Phoenix agrees that Snape needs to stop spying. Everyone knows he will be hard to convince, but Sirius feels certain he can persuade. Warnings:18 Language, mature content, mentions of s/m. Oneshot.. That turned into a fourshot and just seems to keep going. I wanted to write more. Same warnings.