Leo would gently nudge away their advances, and if the bae asks about it he'd really just tell them that he wasn't up for it. He'd feel a little bad at having to brush him off, but today just wouldn't be his day. He would totally accept the kisses and snuggles, but other than that its just chilling.
Raph would probably brush them off a little too harshly, and if the bae's a sensitive bean (like m'self) they'd probably be a little hurt and more reserved for the rest of the night. Raph would have to come clean later on, telling his bae about the shitty day he's had, and that it was nothing against them. They'd suggest doing some stuff he'd like to do instead, and its then he's thankful for 'em.
Donnie would act like he wasn't noticing. He's not one to say 'no' often, so the bae has to catch on to his discomfort and lack of enthusiasm. He'd tell them if they'd ask, and would just feel really shitty even after they tell him they understand. The last thing he wants is to disappoint them on date night, so he'd make a mental note to make up for it tenfold next date night. They do spend the rest of the night snuggling, because he liked those best.
Mikey would tell them gently, being a little cautious and quiet and hoping that the bae wouldn't take it as an insult. When they don't he becomes visibly relieved, and turns to pull the night together and do some fun stuff with the bae. He did appreciate the kisses and thigh rubs though, so there would be lots of smooching and groping in the night. Lots of affection, either way.

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DT Ninja Turtle Headcanons
Romance(18+) Just a work where I can publish all the ask answers I got on my blog. Chapters will pertain to different asks, and can range from long paragraphs to short answers. Turts are 2014/2016 renditions and are over 18+.