http://wolf-forum.forumh.net/c2-lion
Its a bit tricky to mate in lion.
First try to get all four bars (health, stamina, food, and water) full.
Then, if you're a lioness, press 'U'. If the lioness rolls over, she's willing to mate.
Approach the male and harass him constantly by following him, roaring, etc. It helps if his four bars are near full too. What you want to do is press 'u' when near him and click on him. If you were successful, you will see a quick mating scene. Do this until you can no longer mate. Wait a few game hours or days and repeat the process.
If your lioness is pregnant, she will no longer want to mate. It will take about 180 days for the cubs to be born. They will function the same as the other lions, but will be smaller in size. You cannot play as your cubs. It takes about 800 days for them to grow up fully, and they will either join the pride as an adult member, or leave. Hope I helped
