Merlin knew that Arthur was upset about splitting up with Guinevere, so he decided to give him a reassuring hug. Merlin walked into Arthur's chambers, but Arthur had other ideas. Arthur had wanted to be with Merlin for all of his life, but Merlin was always too busy. Arthur looked deep into Merlin's eyes and said to Merlin, "Take. Off. Your. Clothes." So Merlin did and they started to make love.
Arthur had sex with Merlin.
Merlin ejaculated.