It wasn't fair for her to be undressing, if he didn't. Even if it was so he could give her pleasure. So he immediately started to take his trousers off too, though he pulled the condoms he had out of his pocket so he didn't forget them.
"It's been a long time," he said, breathless, "since I've done this. Please tell me if- If you want me to do something differently, or- Just tell me," he said, smiling a little. It wouldn't be a blow to his ego for her to tell him something wasn't working for her. He would just adapt.