Anyone else would've heard that Richard wasn't gay and went "hooray!!" and moved on, but Mr. Homo over here wants to abduct him, so he can get him booty butt naked and all greased up to make him prove it. He has repressed homosexual tendencies just like his father.
Richard had to return because he could sense that his pookie omega, Cailus, started ovulating when he was mourning and coping over his death.