Ted's brain had pretty much gone on constant loop of; Oh my god, oh my god oh my god and wasn't doing much in the way of reminding him how to deal with a bra. His fingers however took on a life of their own, and he got the back of the bra unclasped.
He didn't think that he was really capable of talking sensibly right at the moment, so he gave a mental cheer when he got the bra unclasped but not a verbal one.
He kissed her with more urgency then he had before, and used his arms to circle her waist and pull her closer to him.