This is a bit of Fridge Brilliance. The seduced little bit is putting it flippantly thinking of that, judging by his oldest 50 %-brother's age, Kevan was fourteen at most when it began. A absolutely screwed-up case in point occurred when the Duke-Consort of Lillah seduced his stepson, the Earl of Io, which is part of what led to the boy going Ax-Crazy.