Seamus wrapped his arm around Dean's waist, and to anyone else it would've looked like the pair were more than just "friends," but when you've known someone for as long as they had, it was something that Seamus looked passed.
However, he did let go to apparate back. He wasn't a fan of side-along.
"So clearly then, we're both on a mission to have a good shag then," he added as an after thought when they landed next to the flat.