The only thing I remember is that the two main characters are lovers (perhaps one is an alien?) and they merge into one entity at the end of the tale. "It" pours itself a cup of coffee at/near the end. I read it in the 1960's/1970's, but it may have been written before then. Anyone know this piece? Thanks.
The Compleat Consummators by Alan E Nourse.
It is about a dating agency who promise a perfect match.
"One hundred per cent compatibility on all levels, or your money is refunded and the alliance annulled."
Something happens to the couple that are matched:
There was silence then, with only the echos of a strangled scream.
After It had jelled for a while, It got up from the sofa and went into the kitchen to make a pot of coffee.