Dennis hadn't actually thought Tristan was interested in him for 'that' anyway, it was just he didn't know this guy and he really didn't feel comfortable going home with him. What if, despite his whole I'm a nice guy thing, what if he was really a Death Eater? What if he wanted to do horrible experiments on Dennis? Or worse?
He stepped back, pulling his hand away. He had been comfortable, perfectly comfortable, but as always his thoughts dipped into dark places and he wouldn't be able to sort them out for a little while. He knew that much.
Plus he was a little bit offended by the whole 'not wanting you to go home and wallow' thing. He wasn't wallowing. He was grieving. There was a difference.
"Well, I'll send you the stuff by owl." he said loudly, ignoring everything Tristan had said, "it was nice meeting you and if I see Taff at school I'll keep an eye on him for you..." but if Taff was anything like Tristan everyone would probably love him. Just because he was beautiful.