It's more intimate, and because it's with Bruce Tony isn't even bothered by that. Usually the thought of intimacy makes him backpedal faster than it takes for him to drop his pants, and plenty of people would attest to the fact that it doesn't take him long at all. But this is nice. This is safe in more ways than one, and he encourages that groan by sucking at Bruce's neck and humming gently against it.

And because it's Tony, consequences tend to be ignored. For example, the consequences of stroking Bruce's bare abdomen after giving him that surprise handjob and slipping his fingers down just under the edge of his pants are completely unacknowledged. Likewise, the fact that his friend isn't used to contact. Tony may have accidentally or purposely forgot that detail in his decision to run his nails up Bruce's side. The good news is that he's not going anywhere.