The underground crypt

"We will hold the ceremony down in the crypt. Father can serve as one of the witnesses" Osric suggests the stone chambered burial vault beneath the castle used to store his deceased ancestors as the location for their secret wedding. Alanna blushes at the thought of consummating her marriage to her stepson in front of her first husband's tomb "But that will be very disrespectful to your father!"

Osric smirks "Good! That old bastard deserves it for deflowering you while I had to watch! Besides I think having sex in a creepy location like the crypt late at night will feel very exciting". Alanna tries and fails to hide her guilty arousal at the thought of having sex with Osric in front of his father "Alright we will hold our wedding ceremony and consummate our marriage in the underground crypt with the deceased lords serving as witnesses". Their secret will be safe since dead men tell no tales.