An interesting premise.
We've all seen examples of Clark's 'poor judgements' in the past, and he does have a history of lieing to Lois. Still, the level of dishonesty here can only lead to BIG trouble. It's going to be very difficult for Lois to forgive this transgression on their relationship.
I look forward to seeing if you can make it work
Tank (who likes the idea of being up in the clouds when he reveals the secret because if Lois decides that she can't live with such a lieing rat then Clark can just 'drop' her)