It's A Wonderful Life, Mr. Bonnefoy [FrUK]

Arthur Kirkland wouldn't call himself a scientist; he is more of a curious man, one who wants to push the limits. He has tested humans left and right, and though he released him, they were never the same. But then he meets Francis Bonnefoy, the beautiful Frenchman with a horrible past, and he fascinates him. Arthur can not wait to see how far he can push him.