Punctuation is very important!
Texting someone "wanna hook up" can be a general declaration or an offer.
In this case, Adam dropping the apostrophe from "handing out candy at my grandparent's" which implies "...at their place" becomes a humorous image in my head.
I implore you, take the time to use full sentences and punctuation whenever possible while texting. If you're on the subway/bus, you have the time. If you're driving, well, you shouldn't be texting anyhow. Very rarely do you not actually "have the time," you're just being lazy.
I don't mean Adam in this moment, of course, as he provided me inspiration for this drawing.