Flat tires

For some reasons, I haven't ridden my Marin Alpine 29er (TweetyPot) for about three (3) weekends.

This morning, I was surprised to see the flat rear tire and replaced the tube.  Then, in the afternoon, there's another surprise, the front tire was flat too.  What happened?  I didn't know; and, I just replaced the tube too.

The culprits were the same -  torn base of the Presta valves.  But, how they got torn whey they are just parked?

Maybe, she just sulked and had her two tires out of air to attract my attention.  So, I talked to her and made amends.  Then, I explained that I have to buy spare tubes first before using her.