Tek is absolutely taking that tiny hint of aggression as a promise for later. It's what keeps his growl of annoyance at only a quiet grumble when the guards succeed at interrupting them, and it allows him to take the rest in stride.

Robin might know the difference, be able to guess at the vengeful scheming that could be going on in Tek's head as Robin's attention is pulled away from him, but by all other accounts, he hardly seems bothered by this turn of events. He's got his weight braced easily back on one hand, while the other continues to linger affectionately in his partner's hair. When he sighs and finally turns his attention to follow Robin's down the aisle, he regards the approaching guards as if they're only casual visitors happening by.

He lounges and waits and does not look at all like someone who is about to be forced to disengage from his fun.