Quick, type this out:

Pursuant to our conversation of today, this will confirm that you have agreed to share a warm bed with me forever, based on the sole condition that I play my cards right. Inasmuch as I am the person playing said cards and in my sole discretion I have determined that my card playing is "right," this shall act as a BINDING AGREEMENT that from this day forth and forevermore, your bed and mine shall be the same.

Subject to all appropriate Rules regarding unsworn falsification of official documents, we do both do affix our hand and seal this 17th day of January, 2011.

Signature line for him, signature line for you, no Notary necessary.

Congratulations!