In her womb

You Push her into the bed and line your cock up with her pussy and shove it deep inside. The pointed tip of your cock pushes through her cervix.

"AAAhhhaaaaaaaaaaa" She cries in pain and pleaure.

"OH MARLA!" You shout and you cum deep inside her womb deeper than any human man could reach. You pull out before you do any permanent damage to her cervix. Your cock softens and retracts back into your pussy.

You redress and continue the measurements and dressmaking. At some point, Marla declares it too late and you agree that she should come back in the morning. Once you are ready for bed and your dragon parts are covered up by your cloak once again another servant gives you a note from the Queen.

Sofia is to stay in a different room and the dress preparations finished by midday tomorrow as the wedding will start then. It is unlucky to see the bride the night before the wedding so you won't see your sister until you are to be married.

You go to sleep and in the morning you let Marla into your room with your dressmaking stuff and some designs. She settles on one with lots of ruffles to imitate your scale and makes it very poofy at the back to hide your tail stump. Your wings fold around you and over your shoulders where Marla attaches a neckless between the two claws at the top of your wings making them look like an elaborate clasp. Only the knowing eye would think you are a half-dragon wearing a sleeveless dress and no stocking instead of an elaborate female knight leaning into the killing a dragon theme that is the supposed reason this wedding is possible.