Assuming consent on all fronts, and some kind of safe signal?

Tickle.

IME that ends up being strangely harder on a sub and something that can go on longer–with breaks!–than e.g. caning, flogs, etc. If you go too long with a silicone slapper, you can take skin off; to long/hard with a cane, and you’re causing hematomas. Too long tickling? No physical harm done (as long as they don’t, say, dislocate a shoulder; be careful with how you tie people up, folks!), although a sub might pee the bed, or be laughing so hard that they can’t breathe. That means that you can turn around and do it again the next day. Combine being restrained and blindfolded with sound-isolating earbuds so that a sub can’t tell where you are, and intersperse the tickling with sensual touch, and you can have a sub dreading your touch, flinching at nothing, and drag it out for an hour or more.

I’d remove the gag though; tickling combined with a gag can obstruct breathing.

(Not everyone is ticklish though. IME people that tend towards anxiety have a much stronger reaction to tickling.)

Would ask you what you are doing in my bed. If it’s not my bed would excuse myself for entering the wrong room. Ohh wait too realistic 😅

Make sure consent was given and that there was a mutually understood method to revoke that consent despite being ball gagged

I would wonder how the hell I walked into someone else’s house so far without realizing it.

Ur boobs are perfect

going to start with a boobie touch