Sentence:  I felt his strong bones <WSD>anneal</WSD> themselves to my own, his blood vent its bright tide into my veins, the semen of his testicles foam as it dashed in a torrent against mine. 
Meaning of the word marked with <WSD> tags:  To subject to great heat and then (often slow) cooling, and sometimes reheating and further cooling, for the purpose of rendering less brittle; to temper; to toughen.