Having read your letter, my mind wondered to "that special time" in my life. We all go through it, somehow, some way.
In my case, I remember not wanting to "appear stupid" or "appear immature" - so, it was best not to even go there (No pun intended) *smiling*
I would suggest that, you in your wisdom, don´t pick a deadline, but choose the atmosphere. Through out the day ...... let him think Christmas is early this year.
You could for example, use massage where he is on the floor, and you, at some point, are kneeling above him massaging his chest, his face, stroking his lips, nibbling his neck/ears - bearing in mind to move away [not to be obvious], now and again and do your thing with him, a little at a time.
I don´t think I need to elaborate more. Do I? I bet you it works............ Believe me, I know!!