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From my fanfiction days :D

When Tsuna spends too long at his desk with Gokudera, their heads bowed over documents and Gokudera's hair brushing his cheek, Mukuro steals Tsuna away and takes him, fully dressed, against the door to their bedroom so that everyone who passes by can hear every thud of their boss getting nailed by his Mist guardian. When Tsuna takes his tea with Hibari and lingers overlong to discuss business details, Mukuro binds him to their bed afterward and teases him until he's begging for release.

And if Mukuro has noticed Tsuna baiting him more often than not lately, he hasn't said anything about it.