The idea had come to his mind the last time he had been to see Evan, only a few days (and a Scot and Irishman) earlier, but Barty knew it now, knew how exactly to do it. A bit of luck was still required, and it gave him a thrill to so carefully be approaching the hospital wing. Barty had warned Evan to clear it of patients. Oh his ideas were nearly endless, really, but thankfully there was no one within his sight. They may have said something, which gave Evan the possibility of being alerted to his presence.
His feet made no sound on the floor, his very breathing regulated into silence. His training became his focus, though he wasn't actually covering up his visible presence. No, Barty knew Evan well, and if he just had a bit of luck, the man would be entirely focused on some medical whatnot. That was what Barty needed. He was ready, prepared, everything. One spell was all he really needed.
Slipping through the open office, Barty raised an eyebrow. Sitting in a chair was not the ideal situation, but he was fast enough and strong enough to pull it off. Surprise gave him the upper hand. He doubted anyone else was willing to try his idea on Evan, much less in the healer's own office. But as silent as before, Barty slowly calmly moved around behind Evan.
The chair was large, but that was nothing. Barty was sort of to the left side anyway. Grabbing the white lab coat around mid-back, Barty pushed Evan up and down against the desk, sliding the chair sideways and dropping both of their trousers and pants with a single spell. Only half a second later, he pushed completely into Evan, completely hard just from the anticipation and the preparation he had cast on himself ahead of time.
Biting on Evan's neck, Barty smirked, "Hello, dear."