Cliffjumper noticed when Mirage got up from the couch and came up behind him, of course - that was completely impossible to miss, even if he was distracted. Definitely impossible to miss because he was almost always aware of where Mirage was if they were in the same room. And if Mirage wasn't intentionally trying to go undetected, since then not many would notice him.

"What'd y---"

The light brush of pressure was basically nonexistent, and the static was negligible, but Cliffjumper felt it like a spike through him. Exaggeration, of course, but he blushed fiercely, opened his mouth, closed it, then sputtered.

"I--- it's--- nothing. Nothing big," Cliffjumper finally managed, wanting to demand why Mirage had had to do that, wanted to leave but couldn't get his legs to obey.