1) Be my pleasure 2) Blissfully 3) Cheerfully 4) Contentedly 5) Fain 6) Gleefully 7) In a willing manner 8) Joyfully 9) Lief 10) Merrily 11) Readily 12) Willingly 13) With a smile 14) Without reservation 1) Fain 2) Freely 3) Happily 4) Lief 5) Willingly 
• (a.) With pleasure; joyfully; cheerfully; eagerly. • (a.) Preferably; by choice.
Glad'ly adverb [ From Glad , adjective ] 1. Preferably; by choice. [ Obsolete] Chaucer. 2. With pleasure; joyfully; cheerfully; eagerly. « The common people heard him gladly .» Mark xii. 37. 
[adv] - in a willing manner
lief adverb in a willing manner; `this was gladly agreed to`; `I would fain do it`