Of course there is enough Voldemort for three or more weddings, so after planting twins in Prof. Sprout, he proposes to Prof. McGonagall and Mme. Hooch for a threesome wedding. After being put under the Imperius curse, the two women agree but run off to the Hebrides when the curse wears off shortly before the wedding. This leaves Voldie depressed and sad. He is since then often spotted at a small table at the back of the Hog's Head, drunk on Butterbeer, muttering "I love plaid and those Hawk's eyes would've matched my snake ones ..."
And in the end something obvious: Gilderoy Lockhart announces his engagement to...
three guesses...
Yes!!!
GILDEROY LOCKHART!!!
That was easy.