How about "My class was cancelled but I am thinking about doing X so you can spend time with D"

BTW...you are sounding a wee bit controlling....don't try to control him, it only puts you in a bad light and makes you seem needy. I know you are trying to keep that from him, but if you amnipulate enough he will catch on. Also he has probably seen enough of this in the past to recognize it for what it is.

TwinDad
Me 39, W 36, M 11
W - MLC, WAW????
2 Kids B/G 3 YRS Old
Start of the Long and Bumpy Road.....
On the verge of piecing.....a new beginning