Bobby has a bit of an idle touch thing, rubbing Scott's leg during meetings, wrapping an arm around him, snuggling him from behind. That kind of thing.
The first time Bobby touched him outside of a quick hung or an arm over his shoulder, Scott's leg was bouncing erratically underneath the table while they were being briefed on a how the Sentinels were attacking predominantly mutant-based communities. His heart was thumping hard in his chest and he was so scared by that news, that he couldn't stop the bouncing of his leg. Bobby had reached over and placed his hand on Scott's knee, causing him to stop and turn to him. "It's alright, Scott," he mouth, smiling. He gave Scott's knee a slight squeeze like he was ready to pull his hand away but he never did. They sat in the briefing room like that, Bobby's hand on Scott's knee.
Bobby was a touchy-feely kind of guy; that was something you learned quickly. Scott had known for years now, and was no longer as offput by his behaviour like he had been when the institute was first opened. Seeing the way people's eyes would widen or their shoulders would tense when Bobby threw his arm around their shoulders for the first time always made Scott want to laugh. He knew what they were all thinking. Bobby was freezing. It made sense, however. Bobby was made of ice half of the time.
You'd think, with Bobby being so cold, Scott would flinch away from his touch even to this day. Instead, Scott just accepted it, trying to ignore the unusual warmth that spread in his chest when Bobby touched him. He liked the way Bobby's arm would just lay there, as if the wrong move would make it fall down. It never did, though, and they could walk for quite a distance before Bobby would let his arm swing back down.
The first time they kissed, it was because Scott was having an anxiety attack in his bedroom. None of the telepaths had been home and everything inside of Scott bubbled out. Bobby had found him, curled up in a ball in the corner of his closet, sobbing. Scott's chest was so heavy and his throat hurt, but he couldn't calm down. Bobby had knelt beside him and tugged him out of the closet, worry evident in his voice. Bobby sat there and talked him out of his panicked state, all the while, a hand on his shoulder, thumb rubbing soothing circles. After about an hour, Bobby had went to stand and Scott didn't want him to pull away. He tugged Bobby back down and kissed him. The way Bobby's hand went behind his head and cupped the base of Scott's head was probably the best feeling Scott ever had. They kissed in that awkward position for a few moments before pulling apart.
They were in bed together. Scott was sitting up, reading a book and Bobby was playing a game on his cellphone. He swore and tossed his phone down as the sounds of failure chimed from it. Scott saw him in his peripherals looking at him. He grunted when Bobby wrapped his arms around him, warm skin meeting cold skin and nerves jumping at the difference. They stayed like that as Scott read, a small smile tugging at his lips when he heard Bobby softly snoring into the small of his back.
Bobby has a lingering touch, and Scott's learned to accept that fact. In fact, he's come to love that the most about Bobby. Because, when Scott needs to be shown that there is still good in the world, all Bobby has to do is settle that bouncing knee.