wyrm vel goes into heat once a year and gets all feathery and soft and a little more wild looking as his disguise gives up under the influence of it. they're very high maintenance, however actual 'breeding' and outright being needy only lasts a day or two towards the end of the 10-12 days, before the feathers shed (more like enthusiastic humping since they use a magic seal to remain sterile :freerealestate:)