Seductively, no, but having skin to skin- something you do with babies. Something about the photos with/of the son say to me that the poor kid was probably coddled and controlled by his parents and was very close to his father, so the father is taking advantage of the sheltered nature / bond to 'have motherly experiences' even though the kids at an age this should not be happening. At his age you'd be expecting a kid to start not wanting to do silly stuff with parents and certainly not be partially naked in their company, especially if they're under-dressed.
Skeevy tho and I'm sure the son is very poorly socially adjusted, especially so given Dad's Ma'am freakout.