River knew he loved her, even if he didn't say it out loud. A woman just knows these things. Who else would he have tied the knot with her to begin with? Besides the fact that it might very well have been the only way to let her kill him.

More to the point, her hands start with his bow tie, slowly unraveling it and laying it aside. His jacket is the next article of clothing to go as she urges him to sit up so she can slip it from his shoulders. She stops there for a few minutes of wonderful, deep, drugging kisses. More so he could adjust then anything else. Lord knows River could just tear off all his clothes and pounce, she's got enough pent up sexual frustration to power the TARDIS, but it's best if things go slowly.