In the morning, after hubby has showered but before he has gotten dressed, take some almond oil (or coconut oil) and massage his cock and balls with it.
The massage need not take more than two or so minutes. Some kissing and-or dirty talk with the massage will make it more erotic and sensual.
It will get him hard, make him drip, and think of you all day while he works.
And then, once the massage is over, over the course of the day, the almond oil make his cock (skin) and balls soft for touching later.