"We had to be sure." He gives John a look-- do-try-to-behave-yourself-if-you-can. Still, they have peace of mind now thanks to John bringing the equipment-- and they wouldn't have Tosh back at all if not for John.
"Thank you." He leans over and gives John a brief, chaste kiss, wanting to show how much they appreciate it without having John think it's anything more than that.